Share Repurchase Programs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Repurchase Programs (Textual) [Abstract]
Common stock repurchases (in shares)	$ 37,274	$ 6,141	$ 106,286
December 2013 Anti-Dilutive Share Repurchase Program
Share Repurchase Programs (Textual) [Abstract]
Common stock repurchases (in shares)	$ 37,000	$ 6,000	$ 106,000
Common Stock
Share Repurchase Programs (Textual) [Abstract]
Repurchased and retired shares (in shares)	536,298	69,107	1,323,278
Common stock repurchases (in shares)	$ 268	$ 35	$ 662
December 2015 Program
Share Repurchase Programs (Textual) [Abstract]
Maximum number of share repurchases authorization (in shares)		1,500,000.0
Stock repurchase program, number of shares authorized to be repurchased (in shares)		2,000,000
December 2015 Program | December Two Thousand Thirteen Anti Dilutive Share Repurchase Program
Share Repurchase Programs (Textual) [Abstract]
Stock repurchase program, number of shares authorized to be repurchased (in shares)		500,000.0